Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Build a Simple iPhone App with Swift 2.0 Improving Our User Interface Changing the Background Color

Sergio Romero
Sergio Romero
3,665 Points
Posted by Sergio Romero
Sergio Romero
3,665 Points

Changing the background color

Can someone help? "Now that we have an instance of UIColor as a stored property, let's change the background color of the backing view.

Access the view controller's backing view and assign the UIColor instance to the view's backgroundColor property."

colors.swift 
class ViewController: UIViewController {

  let blueColor: UIColor


  override init() {
    self.blueColor = UIColor.blueColor()
  }

    override func viewDidLoad() {
        // Do any additional setup after loading the view, typically from a nib.

    }

    override func didReceiveMemoryWarning() {
        // Dispose of any resources that can be recreated
    }
}

3 Answers

Tobias Helmrich
Tobias Helmrich
31,603 Points
Tobias Helmrich
Tobias Helmrich
31,603 Points

Hey Sergio,

good job, you almost got it right! But firstly the property is called backgroundColor instead of blueColor and also note that you have to change the background color of the view but right now you're trying to change the backgroundColor property of the ViewController because you're using self, however the view controller doesn't have this property.

So if you change the name of the property and use the view instead of the view controller it should work:

class ViewController: UIViewController {

    let blueColor = UIColor.blueColor()

    override func viewDidLoad() {
        // Do any additional setup after loading the view, typically from a nib.
        view.backgroundColor = blueColor
    }

    override func didReceiveMemoryWarning() {
        // Dispose of any resources that can be recreated
    }
}

I hope that helps! :)

Xavier Avery
Xavier Avery
8,059 Points
Xavier Avery
Xavier Avery
8,059 Points

how do u write it in rgb form?

Mitchell Henderson
seal-mask
.a{fill-rule:evenodd;}techdegree
Mitchell Henderson
iOS Development Techdegree Student 4,058 Points
Mitchell Henderson
.a{fill-rule:evenodd;}techdegree
Mitchell Henderson
iOS Development Techdegree Student 4,058 Points 
class ViewController: UIViewController {

    // The challenge is picky, it only accepted an Int of 255 for blue
    let blueColor = UIColor(red: 0/255.0, green: 0/255.0, blue: 255, alpha: 1.0)

    override func viewDidLoad() {
        // Do any additional setup after loading the view, typically from a nib.
        view.backgroundColor = blueColor
    }

    override func didReceiveMemoryWarning() {
        // Dispose of any resources that can be recreated
    }
}